fs: Add missing mutex_unlock (cc967be5) · Commits · 戴 / test

Add a mutex_unlock missing on the error path. At other exists from the function that return an error flag, the mutex is unlocked, so do the same here. The semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/ ) // <smpl> @@ expression E1; @@ * mutex_lock(E1,...); <+... when != E1 if (...) { ... when != E1 * return ...; } ...+> * mutex_unlock(E1,...); // </smpl> Signed-off-by:

Julia Lawall <julia@diku.dk> Signed-off-by:

Al Viro <viro@zeniv.linux.org.uk>

fs/pipe.c

+9 −4

Original line number	Diff line number	Diff line
		@@ -1169,14 +1169,18 @@ long pipe_fcntl(struct file *file, unsigned int cmd, unsigned long arg)

		switch (cmd) {
		case F_SETPIPE_SZ:
		if (!capable(CAP_SYS_ADMIN) && arg > pipe_max_pages)
		return -EINVAL;
		if (!capable(CAP_SYS_ADMIN) && arg > pipe_max_pages) {
		ret = -EINVAL;
		goto out;
		}
		/*
		* The pipe needs to be at least 2 pages large to
		* guarantee POSIX behaviour.
		*/
		if (arg < 2)
		return -EINVAL;
		if (arg < 2) {
		ret = -EINVAL;
		goto out;
		}
		ret = pipe_set_size(pipe, arg);
		break;
		case F_GETPIPE_SZ:
		@@ -1187,6 +1191,7 @@ long pipe_fcntl(struct file *file, unsigned int cmd, unsigned long arg)
		break;
		}

		out:
		mutex_unlock(&pipe->inode->i_mutex);
		return ret;
		}

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